If a,b,c,d are rational numbers(有理数),|a-b|≤9,|c—d|≤16 and |a

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If a,b,c,d are rational numbers(有理数),|a-b|≤9,|c—d|≤16 and |a-b-c+d|=25
If a,b,c,d are rational numbers(有理数),|a－b|≤9,|c—d|≤16 and |a－b－c+d|=25,then |b－a|-|d—c|= ．

|a-b|+|c-d|≤9+16=25,而|a-b|+|c-d|≥|a-b-c+d|=25,又|a-b|≤9,|c-d|≤16,所以|a-b|=9,|c-d|=16,则|b-a|-|d-c|=-7

If a,b,c,d are rational numbers(有理数),|a-b|≤9,|c—d|≤16 and |a let a,b and c be rational numbers and b=0.24-0.26a,c=0.26-0. If rational number a,b,and c satisfy a＜b＜c,then｜a-b｜+｜b-c｜+｜有理数a,b,c,d满足a 若a，b，c，d均为有理数，且|a-b|≤9，|c-d|≤16，|a-b-c+d|=25，则|b-a|-|d-c|=__ let a,b and c be rational numbers and b=5分之12-5分之13a,c=5分之13 Let a,b and c are raional numbers which satisfy 已知A,B,C是有理数,|A-B|大于等于9,|C-D|大于等于16,且|A-B-C+D|=25,那么|B-A|-|D- 已知a、b、c、d是有理数,|a-b| a,b,c,d是有理数，|a-b| read as "rational numbers are the set of all numbers a/b(是一个 “a,b,c,d都为有理数”中的“有理数”是什么意思?